A quick and accurate detection method for silica content in limestone, lime and dolomite

Abstract

The invention discloses a fast and accurate detection method for silicon dioxide content in limestone, kalk and dolomite. The detection method comprises the following steps: crushing samples, and drying for 1.5-2.5 h under thea temperature of 105-110 DEG C; mixing 0.1000 g samples and 3.0-4.0 g mixed fluxing agent of sodium carbonate and boric acid evenly, liquating for 18-20 min under athe temperature of 890-910 DEG C, dissolving frits by a 45-55 ml hydrochloric acid and 25-35 ml water, and placing the test solution in a 250-ml volumetric flask; taking and adding 5.00 ml test solution in a 100-ml volumetric flask, adding 18-22 ml ammonium molybdate and still standing for 18-22 min, and adding 45-55 ml mixed acid of oxalic acid and sulfuric acid, 4.80-5.20 ml ascorbic acid-ammonium ferrous sulfate mixed solution; measuring the absorbency of a color development solution at the wavelength of 680 nm through a spectrophotometer, and using blank as a reference; preparing a silicon dioxide standard sample with the concentration of 40 ug / ml, moving and taking 0.00 ml, 2.00 ml, 4.00ml, 6.00 ml, 8.00 ml and 10.00 ml silicon dioxide standard samples, and placing the standard samples in 100-ml volumetric flasks respectively, adding 5.00 ml blank test solution in the volumetric flasks respectively, after color-developing, measuring the absorbency at the same conditions, and then drawing a working curve. The silicon dioxide content in the samples is calculated according to the following formula (shown in the specification). The detection method is fast and efficient, excellent in accuracy, reproducibility and stability, and particularly suitable for detection of samples with silicon dioxide content equal to or higher than 4 %.

Description

technical field [0001] The invention belongs to the technical field of metallurgical material testing and analysis, in particular to a fast and accurate detection method for silica content in limestone, lime and dolomite. Background technique [0002] In iron and steel smelting production, limestone is mainly used for slag making in iron smelting, lime is mainly used for slagging and desulfurization in steel making, and as a flux for sinter and pellet ore, and dolomite is mainly used for sintering metallurgical furnace bottom after calcination repair furnace lining. The main component of limestone, lime and dolomite—the content of silicon dioxide has an important impact on the performance of the product, so the accurate determination of its content has very important practical significance for smelting production. In the traditional silica content determination method, the molybdenum blue photometric method measures the upper limit of silica content to 4%, which is not suit...

AI Technical Summary

Problems solved by technology

In the traditional determination method of silica content, the upper limit of silica content measured by molybdenum blue photometry is 4%, which is not suitable for the determination of samples with silica content > 4%; although perchloric acid dehydration gravimetric method is applicable It is suitable for the determination of samples with silica content > 2%, but this method does not completely decompose some samples, which is easy to cause analysis errors, and the analysis time is long and the cost is high

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